Angles in a quadrilateral

Angles · Shapes & Geometry

Sort acute, right and obtuse angles; find missing angles on a line, in a triangle, in a quadrilateral.

This is step 4 of unit 6, “Angles”, in Stage 5: Big numbers, fraction and decimal sums, angles (ages 11). A round has 10 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.